Old Fashioned Caramel Pie

Leave oven on from baking pie shells. Whisk together the 1-2/3 cups sugar and cornstarch in a large (at least 2 qt.) microwaveable bowl until there are no more lumps from the cornstarch. In a separate bowl, whisk together the milk and egg yolks. Pour the milk mixture into the sugar mixture and whisk together until smooth. Add the butter to the top of the mixture.

Microwave on high for 3 minutes. Whisk thoroughly. Continue microwaving for 3 minutes and whisking until the consistency is like pudding. Whisk in the vanilla. Set aside.

Put the 2/3 cup sugar into a small iron skillet. Cook, stirring constantly, on high until brown and bubbling. It will look like it's going to boil over. Pour IMMEDIATELY into cooked filling and whisk thoroughly. Divide between the 2 pie shells.

Beat the egg whites and cream of tartar (if using) until foamy and slightly holding shape. Turn beaters on low speed. Add the 3/4 cup sugar. After sugar is mixed in, turn beaters on high again. Beat until meringue is hard to shake off a spoon (or it stays on beater when you turn off mixer and pull beaters out of bowl). Spread meringue onto filling all the way to the edges.

Bake about 10 minutes or until brown. Watch closely. Turn off oven, open oven door slightly, and let pies cool in oven for 1 hour. Let pies cool completely on counter. Spray plastic wrap with Pam, cover pies and refrigerate.